Heat oven to 350 degrees. ... Cool completely, then frost with the recipe that follows. Mix butter and chocolate thoroughly. Blend in sugar. Stir in sour cream and vanilla. Beat until frosting is smooth and of spreading consistency.
In the top of a double boiler, melt the chocolate chips and butter. Remove from heat and add the sour cream, vanilla and salt; mix ... thick but spreadable consistency.
Mix butter and cooled chocolate thoroughly. Blend in sugar. Stir in sour cream and vanilla; beat until frosting is smooth and of spreading consistency.
In a saucepan melt chocolate and butter over low heat, ... minutes. Stir in sour cream, vanilla and 1/4 teaspoon ... of spreading consistency. Frosts 2 (8" or 9") layers. Store in refrigerator.